Dude those temperatures are INSANELY LOW for the clocks and volts you're talking about. I frankly cannot imagine you're actually looking at the GPU temperature here, you must be looking at the PCB temps.

I have SLI 470's w/about the best cooling you can have on air (TFII solid copper coolers), w/two empty spaces between cards, and 1.1V and 840MHz will push my cards to 94-95C while gaming w/o vsync (when usage is >95%), or running Heaven or the like.

Literally, there is absolutely no way you're at 61C w/OC's like that on SLI 470's. Your sensors must be broken, or you're looking at the wrong temp gauge.

Man how does your cards stay so cool? I am running 750/1500 @ 1.05v and my temps are about 68ish on both cards at 90 percent fans. I'm running at ultra settings but I don't know if that makes a difference.

I have very good cable management, I have 2 200mm fans for in/out flow, 3 120mm fans for inflow 2 of the 3 are blowing directly onto the GPU's third is a exhaust directly above the GPU's over the CPU. Have 2 120mm CPU coolers on my japanese cooler. And lastly I have 2 120mm rear exhaust fans.

My case is pretty much clear of any cables, so airflow is almost none restriceted. My sensors are fine, I know how to read GPU temps, both GPU-z MSI, EVGA prision, ALL read the same. Just cause you got cards that wanna explode don't mean mine want to! haha!

Forgot to add, friday I'll be buying 6 additional 120mm Corsair fans. My side panel will be a layer of inflow at the bottom/middle, and exhaust at the top. I'll also be raising my towers height and installing a 120mm inflow fan on the bottom of the case. Want a third 120mm exhaust on the rear, but I don't have the space. So I might rig up a addition 4 120mm fans into the front of my case.

If I do that, I'll have a a plastic devider above we're my 200mm inflow fan sits so the 4 120mm won't steal the none heated air before it has time to enter the case.